EP1694389A1 - Sicherheitsvorrichtung für eine spritze - Google Patents

Sicherheitsvorrichtung für eine spritze

Info

Publication number
EP1694389A1
EP1694389A1 EP04796023A EP04796023A EP1694389A1 EP 1694389 A1 EP1694389 A1 EP 1694389A1 EP 04796023 A EP04796023 A EP 04796023A EP 04796023 A EP04796023 A EP 04796023A EP 1694389 A1 EP1694389 A1 EP 1694389A1
Authority
EP
European Patent Office
Prior art keywords
shield
barrel
needle cannula
medical device
stopper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04796023A
Other languages
English (en)
French (fr)
Other versions
EP1694389B1 (de
Inventor
Jamie Crawford
Frank Francavilla
Roger Groskopf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Becton Dickinson and Co
Original Assignee
Becton Dickinson and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Becton Dickinson and Co filed Critical Becton Dickinson and Co
Publication of EP1694389A1 publication Critical patent/EP1694389A1/de
Application granted granted Critical
Publication of EP1694389B1 publication Critical patent/EP1694389B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/326—Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/3245—Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/3247—Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/326—Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
    • A61M2005/3261—Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user triggered by radial deflection of the anchoring parts between sleeve and syringe barrel, e.g. spreading of sleeve retaining hooks having slanted surfaces by engagement with conically shaped collet of the piston rod during the last portion of the injection stroke of the plunger
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/326—Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
    • A61M2005/3261—Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user triggered by radial deflection of the anchoring parts between sleeve and syringe barrel, e.g. spreading of sleeve retaining hooks having slanted surfaces by engagement with conically shaped collet of the piston rod during the last portion of the injection stroke of the plunger
    • A61M2005/3263—Trigger provided at the distal end, i.e. syringe end for mounting a needle

Definitions

  • the present invention relates to a medical device for delivering a dose of medicament by injection and having a shield system for preventing accidental needle sticks after use. More particularly, the present invention is directed to a syringe assembly including a safety shield system.
  • Syringes used for the delivery of medicaments to patients are well known. Oftentimes syringes are prefilled with a dosage of a medicament or other substance by a pharmaceutical manufacturer and then distributed to end users such as health care professionals or patients for administration of the prefilled medicament.
  • Such syringes typically include a cylindrical hollow barrel which may be formed of a glass or plastic material and which includes the medicament.
  • a syringe assembly which typically includes the above-described components, is usually stored with a removable needle cover which protects the needle from damage during storage and handling. Prior to use, the needle cover is removed to expose the needle.
  • the syringe assembly may incorporate a safety shield which forms a guard to cover the needle after use.
  • a safety shield which forms a guard to cover the needle after use.
  • the present invention relates to a syringe incorporating a safety shield for covering the needle after administration of the dosage of medicament in the syringe.
  • the safety shield is automatically activated upon full delivery of the medicament dosage in the syringe.
  • the term "medicament” is intended to refer to any drug substance, vaccine, or other liquid substance that is injected into a patient.
  • a medical device for delivery of a dosage of medicament to a patient which includes a syringe assembly and a shield system.
  • the syringe assembly includes a cylindrical barrel having a forward end and a rear end and a reservoir defined therebetween and within which a medicament may be held and from which the medicament may be expelled.
  • the syringe assembly also includes a cannula or needle cannula (those terms being used interchangeably herein) provided at the forward end of the barrel and having a forward tip and a rear end in fluid communication with the reservoir for delivery of the medicament to the patient.
  • the syringe assembly further includes a plunger rod having a stopper arranged at one end and a thumb pad or thumb press area arranged at the other end, the thumb pad being operable for receiving medicament delivery pressure for pressing the stopper of the plunger rod into the barrel and causing the stopper to move within the barrel to cause delivery of the medicament.
  • the terms "thumb pad” and “thumb press area” designate a region coupled to or otherwise formed on an end of the plunger for receiving force applied to the plunger in an intended manner.
  • the shield system comprises a first shield connectable proximate the front end of the barrel, a second shield movable from a first position to a second position.
  • the shield system also includes an urging member urging the second shield toward the second position, a retaining device for holding the second shield in the first position, and a release mechanism for releasing the retaining device after the stopper has been fully inserted into the barrel, wherein the forward tip of the needle cannula is at least partially exposed when the second shield is in the first position, and the forward tip of the needle cannula is covered by the second shield when the second shield is in the second position.
  • the second shield of the shield system is inserted telescopically in the first shield when the second shield is in the first position.
  • the end of the second shield facing the barrel has a flange which interacts with the retaining device for holding the second shield in the first position.
  • the retaining device may include a flexible arm arranged on the first shield having a retaining element for interaction with the flange.
  • the release mechanism includes a tubular element arranged on the needle cannula and which is sealingly inserted with the needle cannula in an opening at the front of the barrel.
  • the tubular element extends into the barrel such that the stopper contacts the tubular element at a contact position before the stopper is fully inserted in the barrel.
  • the tubular element is pushed by the stopper as the stopper moves from the contact position to the fully inserted position.
  • the tubular element is arranged to force the flexible arm radially outward when the tubular element is moved by the stopper to release the second shield.
  • the tubular element of the release mechanism includes a tubular portion and a flange portion arranged between two longitudinal ends of the tubular portion.
  • the tubular portion is molded from a rigid material for supporting the needle cannula and the flange portion is molded from a flexible material having a flexibility sufficient to provide a seal at the front of the barrel.
  • the flange portion may interact with the retaining device to release the second shield.
  • the urging member which may, for example, comprise a spring, is arranged between the tubular element and the second shield. More specifically, the urging member is arranged between the flange portion of the tubular element and the second shield.
  • the first shield may comprise a lip at a front end thereof for retaining the flange of the second shield at the front end of the first shield when the second shield is released.
  • the first shield may further comprise a locking device for locking the second shield in the second position.
  • the locking device may include a flexible arm which allows the flange to pass the flexible arm as the second shield moves toward the second position and prevents the second shield from moving back toward the first position from the second position.
  • the second shield may comprise an annular bump between first and second ends thereof and the retaining device may comprise a lip arranged at a front end of the first shield which interacts with the annular bump.
  • the release mechanism may comprise a tubular element arranged on the needle cannula with a hub portion facing the barrel.
  • the hub portion contacts the stopper at a contact position before the stopper reaches a fully inserted position.
  • the tubular element and hub are then pushed by the stopper when the stopper moves to the fully inserted position in the barrel.
  • the tubular element moves the second shield such that the annular bump is forced passed the lip to release the second shield when the stopper is moved to the fully inserted position.
  • the barrel of the syringe may comprise a cylindrical barrel portion for holding the medicament, and a front portion having a small cylinder and a transition portion between the small cylinder and the cylindrical barrel portion.
  • the release mechanism includes a tubular element arranged on the needle cannula and is sealingly inserted with the needle cannula in an opening defined by the small cylinder.
  • the first shield is connected on an outer surface of the small cylinder.
  • the barrel of the syringe may be made from a plastic material or a glass material as is known in the art.
  • the cylindrical barrel portion may be made from a glass material and the front portion may be made from a plastic material.
  • the object of the invention is also met by a shield system for connection to a syringe for preventing inadvertent needle sticks after use of the syringe.
  • the shield system comprises a first shield connectable proximate a forward end of the syringe, a second shield movable from a first position to a second position, an urging member urging the second shield toward the second position, a retaining device for holding the second shield in the first position, and a release mechanism for releasing the retaining device from the first position.
  • the present invention allows one-hand operation and requires no change in current medicament delivery techniques.
  • the present invention allows dose adjustment, allows inspection of contents after activation of the shield, and the drug and scale on the syringe are visible to the end user. Activation of the shield does not interfere with administration of the dose because the shield is activated after the dose has been fully delivered.
  • Fig. 1 is a partial cross-sectional perspective view of the components of a medical device having a syringe assembly and a shield system according to the present invention
  • Fig. 2 is a cross-sectional side view of the medical device of Fig. 1 prior to use
  • Fig. 3 is an enlarged view of a shield system in the state shown in Fig.
  • Fig. 4 is a cross-sectional perspective view of a barrel of the syringe assembly of the medical device of Fig. 1 ;
  • Fig. 5 is a perspective view of a needle pusher part of the medical device of Fig. 1 ;
  • Fig. 6 is a cross-sectional perspective view of a first shield of a medical device according to the present invention;
  • Fig. 7 is a cross-sectional side view of the medical device of Fig. 1 ready for use;
  • Fig. 8 is a cross-sectional side view of the medical device of Fig. 1 with the plunger rod and stopper at a position to release the second shield;
  • Fig. 9 is an enlarged view of the shield system in the state shown in
  • Fig. 8; Fig. 10 is a cross-sectional side view of the medical device of Fig. 1 depicting the second shield positioned over the needle cannula;
  • Fig. 11 is an enlarged view of the shield system in the state shown in Fig. 10;
  • Fig. 11a is an enlarged cross-sectional view of alternative embodiment of a shield system according to the present invention;
  • Fig. 12 is an enlarged cross-sectional view of a shield system showing an alternative needle shield;
  • Fig. 13 is an enlarged cross-sectional view of a shield system showing an alternative configuration of an urging element;
  • Fig. 14 is an enlarged cross-sectional view of a further embodiment of the shield system according to the present invention;
  • Fig. 16 is an enlarged cross-sectional view of yet another embodiment of the shield system according to the present invention.
  • Figs. 1 and 2 show a medical device 1 for delivery of a medicament into a patient constructed in accordance with the present invention.
  • the medical device 1 includes a syringe assembly 2 which can be prefilled with the medicament to be delivered, and a shield system 3 connected to the syringe assembly 2.
  • the syringe assembly 2 comprises a generally cylindrical barrel 10 defining a reservoir 13 within which the medicament may be contained.
  • the syringe assembly 2 further comprises and a needle cannula 18 having a forward tip 19 and a rear end 17 which is in fluid communication with the reservoir 13 and which is connected at a front end of the barrel 10 by a needle pusher 16 which will be explained in more detail below.
  • the needle cannula 18 may comprise any sharp or blunt tubular device which is used for delivering a medicament to a patient.
  • the barrel 10 may be made of any glass or plastic material suitable for holding a medicament.
  • the syringe assembly 2 further comprises a plunger rod 12 having a first end inserted in the barrel 10.
  • a stopper or piston 14 arranged on the first end of the plunger rod 12 is longitudinally movable with the plunger rod 12 within the barrel 10.
  • a second end of the plunger rod 28 includes a thumb press area or thumb pad 15 which receives pressure from the user's thumb for pressing the piston 14 into the barrel 10 and for moving the piston 14 in and through the reservoir 13 for delivering the medicament.
  • the rear end of the barrel 10 includes a flange 11 which functions as a finger rest to facilitate the delivery of the medicament.
  • a flange 11 which functions as a finger rest to facilitate the delivery of the medicament.
  • other finger rest configurations may be formed, such as two opposing projections or other flange configurations arranged at different areas along the barrel.
  • the shield system 3 surrounds the external portion of the needle cannula 18 on the front end of the barrel 10.
  • a removable needle shield 27 (see Fig. 2) is connected to the front of the barrel 10 covering both the needle 18 and the shield system 3.
  • a removable needle shield 27' may be designed to connect to the front end of the shield system 3 as shown in Fig.
  • the barrel 10 comprises a cylindrical section 10a and a front section 10b.
  • the front section 10b includes a small cylinder 40 and a transition section 38 which connects the small cylinder 40 to the cylindrical section 10a.
  • the barrel 10 may comprise glass or plastic.
  • the cylindrical section 10a may comprise glass and the front section 10b may comprise plastic. This allows the small cylinder 40 to be formed, such as by molding, with a circumferential bump or collar 36. The function of the collar 36 is described below.
  • the needle pusher 16 includes a tubular piece 16a which fits through an opening 34 defined through the small cylinder 40 of the front section 10b.
  • the needle pusher 16 also includes a flange portion 16b arranged on the tubular piece 16a and which provides a seal at the tip of the small cylinder 40 during use.
  • the needle pusher 16 is preferably molded from two different materials.
  • the tubular piece 16a is formed of a resilient moldable material, such as plastic, which provides the necessary rigidity for supporting the needle 18.
  • the flange portion 16b is formed of a flexible material, such as rubber, having sufficient elasticity to function as a gasket between the tubular piece 16a and the barrel 10.
  • the shield system 3 includes a first shield
  • the first shield 20 which is cylindrical and connected to barrel 10 by a snap fit.
  • the first shield 20 is received on the small cylinder 40 so that the annular bump 36 on the small cylinder 40 fits into an annular recess 42 defined on an inner surface of the first shield, thereby holding the first shield 20 onto the barrel 10.
  • the first shield 20 may be permanently connected to the barrel 10 using an adhesive or other more permanent connection.
  • the connection may also be, by way of non-limiting example, made by one of press fitting, spin welding, heat stake, or threading.
  • a second shield 22 is arranged within the first shield 20.
  • the second shield 22 has a radially outwardly extending flange 22a on an end of the second shield 22 and in a direction of the first shield 20.
  • the urging member 24 may be arranged anywhere between the second shield 22 and the needle pusher 16 or between the first shield 20 and the second shield 22.
  • Fig. 13 shows the urging member 24 arranged between the front wall 44 of the second shield 22 and a front face 46 of the needle pusher 16. As shown in FIG.
  • first shield 20 proximate transition section 38 has a flexible collar 26 which may, alternatively, be configured as flexible arms configured to have a radial channel 31 formed between a retaining member 32 and a shoulder 33 for seating about the flange 22a.
  • An edge of the shoulder 33 which faces the gasket 16b is angled to facilitate movement of the gasket 16b over the shoulder 33 as explained below.
  • the seating of the flange 22a in channel 31 prevents the second shield 22 from moving forward toward the end of needle cannula 18 under the urgency of the spring 24, which is maintained in a "charged" state before deployment of the second shield 22.
  • the needle shield 27 is removed from the medical device 1 exposing the needle cannula 18 as shown in Fig. 7.
  • the forward tip 19 of the needle cannula 18 is inserted into a patient for the delivery of the medicament.
  • Delivery of the medicament is accomplished by application of a medicament delivery pressure to the thumb pad 15 causing the plunger rod 12 and stopper 14 to move into the barrel 10 and within the reservoir 13, thereby urging the medicament in the barrel 10 through the needle cannula 18.
  • the plunger rod 12 is almost fully inserted into the barrel 10 and the stopper 14 rests against the end of the needle pusher 16.
  • the user applies additional pressure to the thumb pad 15 to urge the plunger rod 12 further into the barrel.
  • the second shield 22 can then be urged forward over the end of the needle cannula 18 by the urging member 24 to the position shown in Figs. 10 and 11. [0025]
  • the second shield 22 is prevented from being ejected out of, or detaching from, the first shield 20 by a lip 30 formed at the front end of the first shield 20 which engages flange 22a.
  • additional flexible arms 28 are arranged just behind the lip 30 and function as a one-way guide for allowing the flange 22a of the second shield to pass as the second shield 22 is moved over the needle cannula 18, and for preventing the second shield 22 from moving back into the first shield 20.
  • the medical device 1 may then be safely handled without inadvertent stabbing or sticking of the user from the now-used and contaminated needle cannula 18.
  • the flexible arms 26' are arranged on the second shield 22' and tabs 22a' are arranged on the flexible arms 26' which interact with a flange 32' on the first shield 20' to retain the second shield 22' in the first shield 20'.
  • the flange 16b" is angled toward a forward direction of motion of the second shield 22'.
  • flange 16b" interacts with arms 26' and urges them radially inward to clear flange 32' which releases the second shield 22' and allows it to move forward under the urgency of the urging member 24 (not shown in Fig. 14).
  • the second shield 22' covers the needle cannula tip 19, the second shield 22' may be held in that position by a lip and a flange similar to the lip 30 and retainer 28 shown in Fig. 6.
  • the retainer 28 may comprise an annular member.
  • the shield system 3 of a medical device 1 in accordance with the present invention includes an add-on assembly which may be provided to the user already attached to the syringe barrel 110 or may be provided as a separate component which is attached to the barrel 110 at the user end prior to use.
  • the add-on assembly includes a first shield 120 that is slidably mounted to the front of a syringe barrel 110 and movable from a first position wherein a spike 135 is isolated from the reservoir as shown in Fig. 15, to a second position wherein the spike 135 is in communication with the reservoir.
  • the syringe barrel 110 is prefilled and incorporates a membrane such as a foil seal 111 at the end thereof or some other type of sealing membrane.
  • Fig. 15 shows the first position of the barrel 110 before the spike 135 has broken the seal but before the barrel is fully coupled to the first shield 120.
  • the first shield 120 can then be further inserted toward barrel 110 by a distance c to the second position i.e. to the fully coupled state.
  • This embodiment operates similarly to the previous embodiments in that the plunger rod (not shown in Fig. 15) urges the needle pusher 116 forward relative to the first shield 120 by contacting the pusher hub region 116b to release a retaining device.
  • the urging member 124 is arranged between the pusher hub region 116b and a second shield 122.
  • the pusher hub region 116b is prevented from moving rearward by projection 121 which may be a rim or discrete projections.
  • the second shield 122 is prevented from moving forward by the interaction between an annular bump 122b on the outer surface of the second shield, and a lip 130 of the first shield 120.
  • the urging member 124 urges the second shield 122 over the needle until the flange 122a of the second shield rests against the lip 130.
  • This embodiment also includes a lock for holding the second shield 122 in the safe position, such as the flexible arms 28 shown in Figs. 6 and 11.
  • the barrel 110 is not prefilled, the requirement for the spike 135 is obviated.
  • Fig. 16 shows an alternative embodiment in which a seal 117 is arranged between the hub 116b of the needle pusher 116 and the first shield 120 for creating a seal between the barrel 110, the first shield 120 and the needle pusher 116. Operation of the embodiment shown in Fig. 16 is similar to that of Fig. 15. In both embodiments of Figs. 15 and 16, a needle shield such as the needle shield 27 shown in FIG. 2 or needle shield 27' shown in Fig. 12 may be used for protecting the needle 118 prior to use.
  • Fig. 11a shows another alternative embodiment in which the lip 30' comprises first and second sections 30a, 30b that are axially offset from each other.
  • the flange 22a When the second shield 22 is pushed into the activated position, the flange 22a first contacts the first section 30a which causes the second shield to pivot about the initial point of contact at section 30a until another part of the flange 22a rests on the second section 30b (or until the shield 22 contacts the needle cannula), as shown in Fig. 11a. In this position, the second shield 22 is askew relative to the needle cannula 18 and the needle cannula is not aligned with the hole in the wall 44 through which it was formerly inserted.
  • This configuration prevents inadvertent sticks because when the second shield 22 is pressed into the first shield 20, the tip of the needle cannula 19 is not aligned with the hole in the wall 44 but, instead, contacts the wall 44 to maintain the needle tip within the second shield.
  • the health care professional receives the inventive medical device 1 prefilled with a desired single dosage of a medicament.
  • the needle shield 27 is removed and the needle cannula 18 and forward tip 19 are exposed.
  • the health care professional pierces the patient's skin with the forward tip 19 of the needle cannula 18 and depresses the thumb pad 15 to cause the plunger rod 12 and stopper 14 to move within the reservoir 13.
  • the medicament is caused to be expelled from the reservoir, through the needle cannula 18, and into the patient.
  • additional pressure will then be applied to the thumb pad 15 (with or without the needle cannula 18 removed from the patient), to urge the plunger rod further into the barrel.
  • This further movement causes the needle pusher 16 to release flange 22a from the channel 31 whereby the second shield 22 will then be deployed by the urging member 24 to a position covering the needle cannula tip 19.
  • the lip 30 formed at the front end of the first shield 20 engages flange 22a of the second shield to maintain coupling between the first and second shields.
  • the covering of the needle cannula tip 19 by the second shield prevents undesired and inadvertent exposure of the health care professional to the contaminated tip 19.
  • the used medical device 1 may then be disposed of in a suitable sharps disposal container.
EP04796023.2A 2003-11-03 2004-10-21 Sicherheitsvorrichtung für eine spritze Active EP1694389B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/700,009 US7101351B2 (en) 2003-11-03 2003-11-03 Safety device for a syringe
PCT/US2004/034959 WO2005044351A1 (en) 2003-11-03 2004-10-21 Safety device for a syringe

Publications (2)

Publication Number Publication Date
EP1694389A1 true EP1694389A1 (de) 2006-08-30
EP1694389B1 EP1694389B1 (de) 2018-12-05

Family

ID=34551095

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04796023.2A Active EP1694389B1 (de) 2003-11-03 2004-10-21 Sicherheitsvorrichtung für eine spritze

Country Status (5)

Country Link
US (1) US7101351B2 (de)
EP (1) EP1694389B1 (de)
JP (1) JP4771957B2 (de)
ES (1) ES2714558T3 (de)
WO (1) WO2005044351A1 (de)

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WO2005044351A1 (en) 2005-05-19
US20050096599A1 (en) 2005-05-05
WO2005044351B1 (en) 2005-07-21
JP2007510503A (ja) 2007-04-26
US7101351B2 (en) 2006-09-05
ES2714558T3 (es) 2019-05-29
EP1694389B1 (de) 2018-12-05
JP4771957B2 (ja) 2011-09-14

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